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. Author manuscript; available in PMC: 2019 Dec 30.
Published in final edited form as: Rapid Commun Mass Spectrom. 2018 Dec 30;32(24):2166–2173. doi: 10.1002/rcm.8298

Scheme 4.

Scheme 4.

Proposed mechanism for rearrangement reaction of histidine-containing Schiff-base-modified peptides between an imine group and a neutral imidazole group. N-terminal histidine residue is used here as an example.